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An initialism of "can't talk now," used primarily in real-time online communications, such as chat rooms or instant messaging. Often spelled in lowercase letters. A: "hey, u there?" B: "sry, ctn, have 2 study" A: "I wanted to ask you about the financial report." B: "Sure, CTN though. Trying to get this spreadsheet finished before lunch."
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.